20545453402 has 4 divisors (see below), whose sum is σ = 30818180106. Its totient is φ = 10272726700.

The previous prime is 20545453367. The next prime is 20545453417. The reversal of 20545453402 is 20435454502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20435454502 = 2 ⋅10217727251.

It can be written as a sum of positive squares in only one way, i.e., 13073406921 + 7472046481 = 114339^2 + 86441^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5136363349 + ... + 5136363352.

Almost surely, 2^20545453402 is an apocalyptic number.

20545453402 is a deficient number, since it is larger than the sum of its proper divisors (10272726704).

20545453402 is a wasteful number, since it uses less digits than its factorization.

20545453402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10272726703.

The product of its (nonzero) digits is 96000, while the sum is 34.

The spelling of 20545453402 in words is "twenty billion, five hundred forty-five million, four hundred fifty-three thousand, four hundred two".