20251490 has 32 divisors (see below), whose sum is σ = 41904000. Its totient is φ = 6902784.

The previous prime is 20251457. The next prime is 20251493. The reversal of 20251490 is 9415202.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20251493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12761 + ... + 14259.

It is an arithmetic number, because the mean of its divisors is an integer number (1309500).

Almost surely, 2^20251490 is an apocalyptic number.

20251490 is an abundant number, since it is smaller than the sum of its proper divisors (21652510).

20251490 is a wasteful number, since it uses less digits than its factorization.

20251490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20251490 is about 4500.1655525103. The cubic root of 20251490 is about 272.5747739700.

Adding to 20251490 its reverse (9415202), we get a palindrome (29666692).

The spelling of 20251490 in words is "twenty million, two hundred fifty-one thousand, four hundred ninety".