155020690 has 64 divisors (see below), whose sum is σ = 322486272. Its totient is φ = 53099200.

The previous prime is 155020627. The next prime is 155020693. The reversal of 155020690 is 96020551.

It is a super-2 number, since 2×155020690² = 48062828656152200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155020693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179199 + ... + 180061.

It is an arithmetic number, because the mean of its divisors is an integer number (5038848).

Almost surely, 2^155020690 is an apocalyptic number.

155020690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155020690 is an abundant number, since it is smaller than the sum of its proper divisors (167465582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155020690 is a wasteful number, since it uses less digits than its factorization.

155020690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 155020690 is about 12450.7305006574. The cubic root of 155020690 is about 537.1924355429.

The spelling of 155020690 in words is "one hundred fifty-five million, twenty thousand, six hundred ninety".