19970155 has 16 divisors (see below), whose sum is σ = 25631424. Its totient is φ = 14883840.

The previous prime is 19970149. The next prime is 19970177. The reversal of 19970155 is 55107991.

It is a happy number.

It is not a de Polignac number, because 19970155 - 2³ = 19970147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7615 + ... + 9895.

It is an arithmetic number, because the mean of its divisors is an integer number (1601964).

Almost surely, 2^19970155 is an apocalyptic number.

19970155 is a deficient number, since it is larger than the sum of its proper divisors (5661269).

19970155 is a wasteful number, since it uses less digits than its factorization.

19970155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406.

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 19970155 is about 4468.7979368058. The cubic root of 19970155 is about 271.3066747865.

The spelling of 19970155 in words is "nineteen million, nine hundred seventy thousand, one hundred fifty-five".